The church of Saint Agnese isn’t often visited by tourists, unless they love early mosaics, like I do. These ones date from the 9th century. St Agnes is in the middle, with flames at her feet because she was put in a fire but the fire didn’t burn her. Like St Paul’s, this church is fuori la mura, that is, ‘outside the walls’. There’s another reason to go here, though. It’s right beside another very important early Christian work of architecture: Santa Costanza (see above).